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Graciela Cabrera's family wonders whether a car crash three weeks ago somehow played a part in the girl's death. But so far, investigators said they just don't know.

School counselors were on hand at Omaha South High School for classmates who are now trying to cope without Cabrera.

"I got home from school, and they told me, and I thought they were playing around," said Cabrera's sister, Carmen Ozuna. "I couldn't believe it."

Two students on the bus attempted CPR, but Cabrera died shortly after at a hospital.

"We'll never get over it," Ozuna said.

On Wednesday, students remembered a classmate and friend.

"There were a lot of students wearing black today, and you can tell she's really missed and loved," said Brianna Beauford.

Cabrera's name scrolled across the school's sign, and a makeshift memorial appeared in the office, where students dropped off notes and drawings.

"They told us to do drawings to support the family, and I made a drawing for her. A Mickey Mouse, like an angel," said Carlos Paredes.

Kathryn Hecht-Weber led grief counseling for faculty and students. She said many of the young people questioned why this would happen.

"What we've tried to do is seize this as an opportunity to remind us all that life is precious, that moments are fleeting. And we want to be the best version of ourselves at all times," said Hecht-Weber.

A counseling team followed Cabrera's schedule to help students who interacted with her every day. They offered group and individual counseling to students and faculty who needed it.

The school is planning to sell ribbons at basketball games to raise money for the family. A moment of silence is scheduled for Thursday's boys basketball game.